Double-filament incandescent lamp.



H. E. MEYERS.

DOUBLE FILAMENT INCANDESGENT LAMP.

APPLICATION FILED MAR. 31, 1906.

Patented Aug. 24, 1909.

UNITED STATES PATENT ornron HENRY E. HEYERS, OF DENVER, COLORADO, ASSIGNOR 0F ONE-FOURTH T0 GUSTAV SCHRAGE AND ONE-FOURTH TO W. E. TALLMADG-E, OF SHEBOYGAN, WISCONSIN.

DOU'BLE-FILAMENT INC'AN'DESC'ENT LAMP.

Application filed March 31, 1906. Serial No. '3'09,03

To all whom 'it may concern Be it known that I, HENRY E. MEYERs,a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Double-Filament Incandescent Lamps, of which the following is a specification.

This invention relates to double-filament incandescent lamps, and my object is to produce a lamp of this character having a globe provided with a plurality of communicating chambers, a filament for each chamber, and a single seal.

A further object is to produce a globe of the character named having a tubular stem,

.a central chamber communicating therewith at one end and an outer chamber also communicating with said stem at one end and surrounding and spaced from the first-named chamber.

A still further object is to produce a globe having an annular exterior rib or bead contiguous to and of greater diameter than the threaded collar of the lamp for the purpose of preventing water from flowing along the globe and into the lamp socket.

\Vith these and other objects in View a hereinafter appear, the invention consists in certain novel and peculiar features of construction and organization as hereinafter described and claimed; and in order that it may be fully understood reference is to be had to the accompanying drawing, in which Figure 1, represents a central vertical section of an incandescent lamp embodying my invention, the section being taken on the line I-I of Fig. 2. Fi '2, is a tip end View of the lamp with half of the globe shown in section on the line II-II of Fig. 1. Fig.3,

is a section taken on the line III-III of posed longitudinally ofthe body portion and forming a central chamber 3; said chamber and chamber 1 of the body portion communieating with each other and with the passage filament being of the tubular stem at their ends adjacent to the latter, the opposite ends of both chambers 3 and 4 being closed. The inner wall of the annular chamber iis preferably aced from the wall of chamber 3' to provi e between them the annular opening or pocket 5 open to the atmosphere at the tip end of the lamp, the open end of said space or pocket haying a flaring or funnel mouth 6 in order to facilitate the deposit therein of a liquid or other substance when the lamp is so disposed that said substance will retain its position by gravity. v

7 indicates a mount for the neck end of the globe, said mount bein provided with a stem which consists preferably of a. central tube 8 and two side tubes 9, the side tubes being preferably disposed at diametrically oppo site sides ofand projecting farther into the globe than the central tube. The side tubes communicate at their base ends with the central tube by preference, and the opposite ends of all of'the tubes are sealed in the usual manner as at 10, the sealing tip of the central tube being disposed preferably at right angles to the sealing tips of the side tubes, as shown.

11 and 12 indicate conductors of copper Specification of Letters Patent. Patented Aug. 24, 1909.

or other suitable material extending through the central tube and secured in the tip 10 thereof to platinum pieces 13 and 14 respectively, and secured to said platinum pieces are the opposite ends of the filament 15 wlhibch occupies the central chamber of the g o e.

16 and 17 indicate copper or equivalent conductors extending through the sidetubes, and, by preference at one end into the central tube, the opposite ends of the conductors being secured in the usual manner to platinum pieces 18 19, which form supports for the opposite ends of the filament 20, said' of substantially W-shape when viewed om the side and occupying the outer chamber of the globe, at opposite sides of the inner chamber bypreference, the said opposite portions of said filament having a connecting portion 21 in the form of an arch bridging the central chamber and,

secured about midway its length to anan chor 22 projecting from the tip-1O of the central tube; One .of the conductors, con- .ductor 1 7 as shown, is connected to one of the conductors, 12 as shown, of the central T lar 2 6 with which is electrically connected the conductors 12 and 17, the connections being as shown or made-in any other suitable or preferred manner. The distance between the most remote surfaces of the tubes 9 must be slightly less than the diameter of the neck at its smallest point in order that the tubes may be fitted into thelamp after being equipped with the filaments, the seal being then formed or completed in the usual manner so as to make it an integral part of the globe. After the globe is sealed the air is exhausted at any suitable point, preferably at the tip of the central chamber sothatthe projection 27 formed by closing the exhaust aperture shall be at the point least objectionable from the esthetic point of view.

' the central chamber will preferably be of In the formation of the globe the wall of colored glass though in some cases it may be referable to form it of clear glass. If ormed ofclear glass it can be readily col-' ored b di ping it into proper solutions and then i it 1s desired to change the color the suitable manner.

originalcolor can be cut off by dipping the central portion of the globe in wood alcohol. Again the wall of the CBIltIitlCllfi-Hlbl can be incased in thin colored paper or a cloth fabric of the desired color or combinations of color. Again if the lamp stands upon its base a colored liquid'can be poured into the o ening or space surrounding the central c amber, or a colored crystal substance could be disposed therein. Of course the wall of the. surrounding chamber could also be formed of colored glass or colored in any The lamp is adaptedto beused as a flash light lamp, that is to say, suitable means are employed to send the; current through the filaments alternately. .This action of course gives a clear and a colored light alternately,

rovided'the inner wall ofthe central chamr is colored. Where the-lamp is arranged horizontally or with its ti end above its base and is exposed to inc ement weather,

water collectin on the globe'willrun toward the base end '0? the lam and out upon the rib or bead 28 and will rop from the latter without entering the socket, not shown, and thus avoid short-circuiting the lamp.

The circuit through the filament 15 is as follows through the contact 24, conductor 11,

conductor 13, filament l5, conductor 14, conductor 12, and conductor 17 to collar 26. The circuit through filament 20 is through contact ring 25, conductor 16, conductor 18' filament 20 and conductor 17 to collar 26.

From the above description it will be apparent that I have produced an incandescent lamp of the character outlined possessing the features of advantage enumerated as do sirable in the statement of the object of invention and Iwish it to be understood that I do not desire to be limited to the exact construction' shown and described as various modifications may be made in the form, proportion detail construction and arrangement of the parts without departing from the spirit and scope of the invention.

Having thus described the invention what secure by Let- 3. Aglobehaving a central chamber and a communicating surrounding chamber, a filament in each chamber, the filament of the surrounding chamber bridging the central chamber, a mount sealed in the globe and common to both chambers thereof and forming a support for both filaments, and an anchor carried by the mount for the bridging portion of the filament of'the outer or surrounding chamber.

4. A lobe having a tubular neck and a hollow end of and communicating with said tubular dy-portion projecting from one neck, and dprovided at its opposite endwith i a longitu mally extending chamber, and with a cylindrical hollow portion arranged within said chamber and com with the hollow body-portion at one end an closed at its opposite end.

5. A globe aving a tubular neckand a hollow body-portion projecting fromone end of and communicating with said tubular neck, and (provided at its opposite end with a longitu with a cylindrical hollow ortion arranged within said chamber and communicating with the hollow body-portion at one end and closed at its opposite end, in combination with a mount sea ed in said tubular neck and eating 5.

inally extending chamber, and.

932,405 i I a equipped with a pair of filaments, one of nected to the side stems; said last-named said filaments projecting into the hollow filament being anchored to the central stem. 10

body-portion and the other into the cylin- In testimony whereof I afiix my signature, drical hollow portion. in the presence oftWo Witnesses. Y

(3. A mount for incandescent lamp globes, HENRY E MEYERS. having a central stem and a pair of side Witnesses: stems, a filament carried by the central stem, H. C. RODGERS,

and a filament having its opposite ends con- G. Y. THORPE. 

